I run about a gallon of sanitizing solution through the pump.
I read an article in winemaker mag - and it recommended running a gallon of acilidated water (citirc acid) through the pads.
I tried that and i still found pad fibers in the wine.
So what i did was i ran a 3 gallons of water (with 1 tbl of citric acid) through the pads - worked like a charm - clear as could be.